Coal-dust burner



April 14, 1931. P. BUSCHLER COAL DUST BURNER Filed Dec. 20, 1928 Patented Apr. 14, 1931 PAUL B'U'SCHLER, OF HANOVER-RICKLINGEN, GERMANY COAL-DUST BURNER Application filed December 20, 1928, Serial No.

The invention relates to burners intended to be used in coal-dust furnaces.

Nit-h coal-dust furnaces of stationary and portable firing installations it is already known to employ burners in which the coal.- dust air mixture ready to be burned, is supplied to the firing chamber by special nozzles.

All of these nozzles, however, are arranged in parallel to the axis of the burner, whereby cylindrical flame is obtained in which the coal-dust particles are mixed with the air only diificultly, and, besides, the distance on which the complete combustion of the coal-dust particles should take place, is very short.

The invention has for its object to make as long as possible the distance at disposal for the complete combustion of the coal-dust particles, in order to facilitatecomplete combustion. This object is obtained by the nozzles not being arranged on the burner in parallel to the axis of the latter, but inclined thereto. This arrangement results in a more lateral direction relatively to the burner being given to fuel jets escaping from the individual nozzles which jets describe an helical way, whereby the corners, otherwise dead, of the firing chamber are fully utilized.

An embodiment of the invention is illus- 0 trated in the accompanying drawing by way of example, in which Figure 1 is a section through a burner showing the new arrangement of the nozzles and Figure 2 is a top View thereof.

Fig. 3 is a vertical section ofthe portion of a firing chamber in which the burner is arranged. The burner 3 is provided for the conventional firing chamber 5. This burner is fed by a fuel and air supply conduit 4. The forward end of the burner 3 terminates in a forward portion 2 in the face of which the nozzles 1 are arranged along concentric circles. it will be noted that the axis of each nozzle lies in a plane parallel to the burner axis. while the axis of the nozzle itself is in clined to the axis of the burner. Consequently the jets escaping from the nozzles 1 enter the firing chamber along helical lines, all portions of the chamberthus being filled. In this manner the relative velocity existing be- 327,416, and in Germany November 19, 1927.

tween the coal-dust particles and the air is considerably increased and a complete combustion is obtained by the extension of the combustion way thus afforded. Besides, the dead corners of the firing chamber are fully utilized. 7

The individual series of nozzles arranged on the concentric circles either may have a common helical direction or each concentrical series may have a direction opposite to that of the neighboring one.

The described arrangement affords the further advantage of additional combustion air eventually supplied to the mixture in the firing chamber being very well mixed therewith in this chamber.

What I claim and desire to secure by Letters Patent, is

In a coal dust firing installation, a common coal dust and air supply conduit, a burner in which said conduit terminates, said burner havin a face plate provided with a large number of nozzles through which the mixture of coal dust and air is adapted to be blown, said nozzles being arranged in concentric circles with the axes of said nozzles lying in planes tangent to a virtual cylinder, the axis of which coincides with the burner axis, the axes of said nozzles being also inclined to the burner axis. 80

In testimony whereof the foregoing specification is signed at Bremen, Germany, this 30th day of November, 1928.

PAUL BUSCHLER. 

